CA2140677C - Apparatus for measuring mass flow - Google Patents
Apparatus for measuring mass flow Download PDFInfo
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- CA2140677C CA2140677C CA002140677A CA2140677A CA2140677C CA 2140677 C CA2140677 C CA 2140677C CA 002140677 A CA002140677 A CA 002140677A CA 2140677 A CA2140677 A CA 2140677A CA 2140677 C CA2140677 C CA 2140677C
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- force
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
- G01F1/30—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter for fluent solid material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
Abstract
In an apparatus for weighing continuously flowing flowable material, in which the mass flow is determined as a function of measurements of forces exerted on at least one plate (I) in contact with the flowing material, the main novel features are that the apparatus is adapted to perform at least two of said measurements in substantial dependence of the distribution of weight, such as between third points (A, B), on a basically rectilinear inclined plate, on which the material flows slidingly. With this ar-rangement, the results of the measurement may be used for creating an expression of the mass flow, the accuracy of which is inde-pendent of the flow velocity, density and friction of the material.
Description
' APPARATUS FOI~ MEASURING MASS FLOW
TECHNICAL FIELD
The present invention relates to an apparatus for weighing a continuous stream of granular or powdery material flowing freely under the influence of gravity, sucr~ as set forth in the preamble of claim 1.
BACKGROUND ART
An apparatus'. of the kind referred to above is disclosed in the international patent application WO
89/11082. This known apparatus comprises an inclined plane plate, on which the material passes slidingly, while the weight of the amount of material present on the plate at each instant is registered by the force it exerts against the plate. Thus, the weight of material being present on a known length of plate, in connection with a measured flow velocity, is utilized to determine i:he mass flow.
In addition to the requirement that this velocity measurement i:~ to be carried out with the sufficient precision indE;pendently of the thickness of the layer of the flowing material (and the consequent differences in radius from the axis of the measuring drum), it is a prerequisite for this arrangement to function correctly, that the flow velocity on the whole plate as uniquely determined by the outlet velocity. This is normally not the case, as a coefficient of friction, that is smaller or greater than the tangE:nt to the angle of inclination of the plate relative to the horizontal, will cause an acceleration or a deceleration respectively of the A
TECHNICAL FIELD
The present invention relates to an apparatus for weighing a continuous stream of granular or powdery material flowing freely under the influence of gravity, sucr~ as set forth in the preamble of claim 1.
BACKGROUND ART
An apparatus'. of the kind referred to above is disclosed in the international patent application WO
89/11082. This known apparatus comprises an inclined plane plate, on which the material passes slidingly, while the weight of the amount of material present on the plate at each instant is registered by the force it exerts against the plate. Thus, the weight of material being present on a known length of plate, in connection with a measured flow velocity, is utilized to determine i:he mass flow.
In addition to the requirement that this velocity measurement i:~ to be carried out with the sufficient precision indE;pendently of the thickness of the layer of the flowing material (and the consequent differences in radius from the axis of the measuring drum), it is a prerequisite for this arrangement to function correctly, that the flow velocity on the whole plate as uniquely determined by the outlet velocity. This is normally not the case, as a coefficient of friction, that is smaller or greater than the tangE:nt to the angle of inclination of the plate relative to the horizontal, will cause an acceleration or a deceleration respectively of the A
material, so that the mean velocity over the plate will be smaller or greater respectively than the outlet velocity as measured.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide an apparatus of the kind initially referred to, with which it is possible to achieve a more accurate measurement of the mass flow independently of the various parameter variations reducing the accuracy of the previously known apparatus discussed above, and this object is achieved with an apparatus for weighing continuously flowing granular or powdery material, in which the mass flow of said material is determined as a function of measurements of forces exerted on an inclined first plate, which is substantially rectilinear in the direction of flow and on which the flowing material flows slidingly, characterized in that said first plate is supported at two different levels by first force-measuring means capable of measuring forces, of which the gravitational force exerted by the material flowing upon said first plate at each of said two levels comprises as a calculable component the force (A, B, A', B') exerted by the flowing material on the plate in a vertical plane and at right angles to the direction of flow, and by at least one of second force-measuring means capable of measuring the frictional force (F) exerted by the flowing material upon said first plate, and a second plate placed in the path of the flow of material and adapted to change the direction of the flow having third force-measuring means capable of measuring solely the force (P), with which the flow is deflected to change its direction, as well as by calculating means for calculating the mass flow from the forces (A, B) as measured by said first force-measuring means or as calculated from measurements by said first force-measuring means, and from at least one of the frictional force (F) as measured by said second force-measuring means, and the deflection force (P) as measured by said third force-measuring means.
Thus, while the above-mentioned known weighing apparatus does not take into account the variations in the velocity of the material during the sliding movement on the plate, the weighing apparatus according to the present invention thus in fact exploits the variation in velocity from inlet to outlet caused by friction and inclination, as the invention is 2a substantially based on measuring the distribution of the material on the plate in combination with either a measurement of the frictional force on the latter and/or the force required to S deflect the stream of flowing material (such a measurement is known per se from several patent publications, such as US patent specification No. 4,637,262, German patent specification No. 3,410,845 and German patent specification No. 3,541,872).
Examples of P~~~rl.. i,.,.,. ;r ;e ,~nea;l,ln r~ "oa rhn rno"fro n~f~,noa mooa"rcmnr,to r., ,"."a",.o ~,., expression for the mass flow, which is independent of the unknown values for flow velocity and frictional resistance, will be explained below with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed portion of the present specification, the present invention will be explained in more detail with reference to the drawings, in which, Figure 1 shows certain basic principles, on which the present invention is based, and Figures 2-5 show four different exemplary embodiments of an apparatus according to the present invention as envisaged for use in measuring mass flow of grain (cereals).
DESCRIPTION OF THE PREFERRED EMBODIMENT
For a sliding movement with friction on an inclined plate 1 being restricted against longitudinal movement and transversally supported in its "third points", i.e. the two points dividing the length L of the plate into three equally long parts L/3 as shown, it can be shown that the ratio A/B between the forces exerted in the upper and lower points of support 2 and 3 respectively equals the ratio v2/vl between the inlet and outlet velocities of the material. This relation can be proved on the basis of the ordinary equations relating to movement, the only prerequisite being that the coefficient of friction can be considered as being constant over the full length of the inclined plate 1.
Further, the passage time along a plate with length L
(m) is equal to 2L/(vl+v2), the latter multiplied with - _. 2140677 the mass flow M (kg/s) and the acceleration of gravity g (m/s2) giving the gravitational force exerted by the flowing material on the plate, this again being equal to (A + B)/cosa, where a is the angle of inclination of the plate relative to the horizontal.
With the frictional force F (=~,(A+B)) based on A and B
as measured and the coefficient of friction ~C, the acceleration will be:
a=g.(sina-F.cosa/(A+B)), with v22-v12=2.L.a leading to the equation:
M = (A + 73) (A+B).tana-F
2.g.L.cosa.(A-B) this being theoretically correct for all values of flow velocitiEa and coefficients of friction.
The two weighing points for the inclined plate 1 may be situated i:n other positions than the third points .
If for example, as shown in Figure 2, the lower transverse sub?port is placed in the mid-point of the plate instead of in its lower third point, while the upper support is moved to the top edge of the plate, then the force exerted will be changed to A' - (A-B)/3 above and B' -- (A+2B)2/3 below, which when inserted in the equation for determining M will give M = (A' + B~) (A'+B').tana-F .
6.g.L.cos«.A' By thus replacing the difference between the two measurements of A and B by the single measurement of A', errors caused by even small discrepancies between A
21 406~~
the constants of the two weighing cells will be avoided in cases where the magnitude A-B is much smaller than each of the magnitudes of A and B.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide an apparatus of the kind initially referred to, with which it is possible to achieve a more accurate measurement of the mass flow independently of the various parameter variations reducing the accuracy of the previously known apparatus discussed above, and this object is achieved with an apparatus for weighing continuously flowing granular or powdery material, in which the mass flow of said material is determined as a function of measurements of forces exerted on an inclined first plate, which is substantially rectilinear in the direction of flow and on which the flowing material flows slidingly, characterized in that said first plate is supported at two different levels by first force-measuring means capable of measuring forces, of which the gravitational force exerted by the material flowing upon said first plate at each of said two levels comprises as a calculable component the force (A, B, A', B') exerted by the flowing material on the plate in a vertical plane and at right angles to the direction of flow, and by at least one of second force-measuring means capable of measuring the frictional force (F) exerted by the flowing material upon said first plate, and a second plate placed in the path of the flow of material and adapted to change the direction of the flow having third force-measuring means capable of measuring solely the force (P), with which the flow is deflected to change its direction, as well as by calculating means for calculating the mass flow from the forces (A, B) as measured by said first force-measuring means or as calculated from measurements by said first force-measuring means, and from at least one of the frictional force (F) as measured by said second force-measuring means, and the deflection force (P) as measured by said third force-measuring means.
Thus, while the above-mentioned known weighing apparatus does not take into account the variations in the velocity of the material during the sliding movement on the plate, the weighing apparatus according to the present invention thus in fact exploits the variation in velocity from inlet to outlet caused by friction and inclination, as the invention is 2a substantially based on measuring the distribution of the material on the plate in combination with either a measurement of the frictional force on the latter and/or the force required to S deflect the stream of flowing material (such a measurement is known per se from several patent publications, such as US patent specification No. 4,637,262, German patent specification No. 3,410,845 and German patent specification No. 3,541,872).
Examples of P~~~rl.. i,.,.,. ;r ;e ,~nea;l,ln r~ "oa rhn rno"fro n~f~,noa mooa"rcmnr,to r., ,"."a",.o ~,., expression for the mass flow, which is independent of the unknown values for flow velocity and frictional resistance, will be explained below with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed portion of the present specification, the present invention will be explained in more detail with reference to the drawings, in which, Figure 1 shows certain basic principles, on which the present invention is based, and Figures 2-5 show four different exemplary embodiments of an apparatus according to the present invention as envisaged for use in measuring mass flow of grain (cereals).
DESCRIPTION OF THE PREFERRED EMBODIMENT
For a sliding movement with friction on an inclined plate 1 being restricted against longitudinal movement and transversally supported in its "third points", i.e. the two points dividing the length L of the plate into three equally long parts L/3 as shown, it can be shown that the ratio A/B between the forces exerted in the upper and lower points of support 2 and 3 respectively equals the ratio v2/vl between the inlet and outlet velocities of the material. This relation can be proved on the basis of the ordinary equations relating to movement, the only prerequisite being that the coefficient of friction can be considered as being constant over the full length of the inclined plate 1.
Further, the passage time along a plate with length L
(m) is equal to 2L/(vl+v2), the latter multiplied with - _. 2140677 the mass flow M (kg/s) and the acceleration of gravity g (m/s2) giving the gravitational force exerted by the flowing material on the plate, this again being equal to (A + B)/cosa, where a is the angle of inclination of the plate relative to the horizontal.
With the frictional force F (=~,(A+B)) based on A and B
as measured and the coefficient of friction ~C, the acceleration will be:
a=g.(sina-F.cosa/(A+B)), with v22-v12=2.L.a leading to the equation:
M = (A + 73) (A+B).tana-F
2.g.L.cosa.(A-B) this being theoretically correct for all values of flow velocitiEa and coefficients of friction.
The two weighing points for the inclined plate 1 may be situated i:n other positions than the third points .
If for example, as shown in Figure 2, the lower transverse sub?port is placed in the mid-point of the plate instead of in its lower third point, while the upper support is moved to the top edge of the plate, then the force exerted will be changed to A' - (A-B)/3 above and B' -- (A+2B)2/3 below, which when inserted in the equation for determining M will give M = (A' + B~) (A'+B').tana-F .
6.g.L.cos«.A' By thus replacing the difference between the two measurements of A and B by the single measurement of A', errors caused by even small discrepancies between A
21 406~~
the constants of the two weighing cells will be avoided in cases where the magnitude A-B is much smaller than each of the magnitudes of A and B.
5 It is a necessary condition that the angle of inclination cx always differ from the friction angle, as both numerator and denominator approach zero, when the coeffic'iE:nt of friction approaches tang, whereby the flow ve7_ocity (and hence the thickness of the layer of material) becomes constant.
Since the absolute magnitude of the forces in relation to a given mass flow decreases rapidly with an increase in the inclination of the plate, the above-mentioned necessary condition implies a limitation of the practical accuracy of this method in cases, where large variations in the friction between the flowing rnaterial and the plate can be expected, e.g. because of variations in the material's water content.
In such cases, a substantial improvement of the accuracy may be achieved by adjusting the angle of inclination of the inclined plate depending on the material's coefficient of friction, so as to achieve an optimal increase in velocity from the inlet velocity vl t;o the outlet velocity v2 together with the consequent distribution of weight on the plate.
The exemplar~t embodiment of a weighing apparatus according to the invention shown in Figure 2 is well suited to such an angular adjustment, the inclined plate 1 in this case being supported vertically with the result that the reaction forces A' and B' on the plate in the equation above in this case are resolved into A
..~ ; 2~ 4p677 - vertical forces A" - A'/cosa and B" - B'/cosa, both being measured directly through the load on the weighing cells 4 and 5, and - the components in the plane of the plate, i.e.
A'tana and B'tana acting at an oblique angle upwardly in the plane of the plate.
As the sum of these components of force exceeds the frictional force F, the resultant force in the plane of the plate will be directed opposite to the direction of movement of the material and will be equal to F" - (A' + B')tana-F, the latter being measured through the weighing cell 6.
Insertion in the expression above for the mass flow M
will now produce an expression, which is independent of the angle a, while at the same time all difference values between measured forces are eliminated, viz.:
F"
M = (A" + B") 6gLA"
The angle of the inclination a is adjusted by means of the adjustment screw 7, being adapted to hold the beam 8 in the desired position relative to its pivot point 9 on the fixed vertical column 10, the latter together with a linkage rod 11 ensuring that the inlet plate 12 is parallel to the beam 8 and the plate 1 parallel to this beam.
For materials with a coefficient of friction ~ in the interval 0.2 < ~ < 0.5 a fixed angle a - approx. 45°
will often give acceptable results, and the exemplary embodiment of the apparatus shown in Figure 3, adapted to measure <i horizontal component D - F"cosa in A
214~677 combination with the vertical reaction force C -H"-F"sina, w_C11 in many cases be more useful, because in practice, measuring the force F" in the plane of a plate may be difficult to achieve. The vertical force component A" in the upper edge of the plate will in this case remain unaltered, and the mass flow is determined by the equation:
M = ( A"+C'+Dtana ) D
6gL cosaA"
Another exemplary embodiment of the weighing apparatus according to the invention, in which the weighings with the inclined plate are combined with measurements of the deflection force on a basically vertical collision plate is shown in Figure 4, in which the material leaving the inclined plate 1 impacts against the rear wall. of a vertical exit duct 13, the latter being supported by vertical linkage rods 14, so that solely the horizontal deflection force P acts upon the weighing cell 15.
The plate 1 is supported perpendicularly to its longitudinal direction in the points 2 and 3, in which the forces A and B are measured by means of weighing cells in e:~actly the same manner as in the diagrammatic Figure 1, while in this case it is not necessary to measure the longitudinally exerted force acting upon tree rod 16.
On the basis of the two equations for the mass flow M = (A+B)2v~ and M = P
2gLcosaA v2cosa A
multiplication and extraction of roots will give A+B P , cosa 2gLA
as the unknown velocity v2 disappears.
Thus, in this embodiment, the measurement of the frictional force F in the embodiments described above is replaced by measurement of the deflection force P, but by in this case additionally measuring the frictional force F, a double assurance for the accuracy of i:he result may be achieved, as a combined calculation based on measuring all four parameters A, B, F and P will produce a highly reliable result.
In the embodiment according to Figure 4 also, it is possible to support the inclined plate 2 in other positions then the third points, as these have solely been chosen to simplify the explanation.
At times it ;may be practically advantageous as shown in Figure 5 to place the inclined plate 1 downstream of the defle~~tion plate 17, the latter in this case preferably being curved and arranged with a vertical inlet and an outlet in the direction of the inclined plate 1, as well as being provided with a weighing cell 18 to measure the deflection force P. As in this case, the inT.et velocity vl on the inclined plate 1 will be used in the calculation instead of the outlet velocity v2, the mass flow M may be determined using the above equ~~tion by interchanging A and B.
a 2~ tip 677 LIST OF PARTS
1 inclined plate 2 upper point of support 3 lower point of support 4 weighing cell 5 weighing cell 6 weighing cell 7 adjustment screw 8 beam 9 pivot point 10 column 11 linkage rod 12 inlet plate 13 exit duct/outlet deflection plate 14 linkage rod 15 weighing cell 16 rod 17 inlet deflection plate 18 weighing cell
Since the absolute magnitude of the forces in relation to a given mass flow decreases rapidly with an increase in the inclination of the plate, the above-mentioned necessary condition implies a limitation of the practical accuracy of this method in cases, where large variations in the friction between the flowing rnaterial and the plate can be expected, e.g. because of variations in the material's water content.
In such cases, a substantial improvement of the accuracy may be achieved by adjusting the angle of inclination of the inclined plate depending on the material's coefficient of friction, so as to achieve an optimal increase in velocity from the inlet velocity vl t;o the outlet velocity v2 together with the consequent distribution of weight on the plate.
The exemplar~t embodiment of a weighing apparatus according to the invention shown in Figure 2 is well suited to such an angular adjustment, the inclined plate 1 in this case being supported vertically with the result that the reaction forces A' and B' on the plate in the equation above in this case are resolved into A
..~ ; 2~ 4p677 - vertical forces A" - A'/cosa and B" - B'/cosa, both being measured directly through the load on the weighing cells 4 and 5, and - the components in the plane of the plate, i.e.
A'tana and B'tana acting at an oblique angle upwardly in the plane of the plate.
As the sum of these components of force exceeds the frictional force F, the resultant force in the plane of the plate will be directed opposite to the direction of movement of the material and will be equal to F" - (A' + B')tana-F, the latter being measured through the weighing cell 6.
Insertion in the expression above for the mass flow M
will now produce an expression, which is independent of the angle a, while at the same time all difference values between measured forces are eliminated, viz.:
F"
M = (A" + B") 6gLA"
The angle of the inclination a is adjusted by means of the adjustment screw 7, being adapted to hold the beam 8 in the desired position relative to its pivot point 9 on the fixed vertical column 10, the latter together with a linkage rod 11 ensuring that the inlet plate 12 is parallel to the beam 8 and the plate 1 parallel to this beam.
For materials with a coefficient of friction ~ in the interval 0.2 < ~ < 0.5 a fixed angle a - approx. 45°
will often give acceptable results, and the exemplary embodiment of the apparatus shown in Figure 3, adapted to measure <i horizontal component D - F"cosa in A
214~677 combination with the vertical reaction force C -H"-F"sina, w_C11 in many cases be more useful, because in practice, measuring the force F" in the plane of a plate may be difficult to achieve. The vertical force component A" in the upper edge of the plate will in this case remain unaltered, and the mass flow is determined by the equation:
M = ( A"+C'+Dtana ) D
6gL cosaA"
Another exemplary embodiment of the weighing apparatus according to the invention, in which the weighings with the inclined plate are combined with measurements of the deflection force on a basically vertical collision plate is shown in Figure 4, in which the material leaving the inclined plate 1 impacts against the rear wall. of a vertical exit duct 13, the latter being supported by vertical linkage rods 14, so that solely the horizontal deflection force P acts upon the weighing cell 15.
The plate 1 is supported perpendicularly to its longitudinal direction in the points 2 and 3, in which the forces A and B are measured by means of weighing cells in e:~actly the same manner as in the diagrammatic Figure 1, while in this case it is not necessary to measure the longitudinally exerted force acting upon tree rod 16.
On the basis of the two equations for the mass flow M = (A+B)2v~ and M = P
2gLcosaA v2cosa A
multiplication and extraction of roots will give A+B P , cosa 2gLA
as the unknown velocity v2 disappears.
Thus, in this embodiment, the measurement of the frictional force F in the embodiments described above is replaced by measurement of the deflection force P, but by in this case additionally measuring the frictional force F, a double assurance for the accuracy of i:he result may be achieved, as a combined calculation based on measuring all four parameters A, B, F and P will produce a highly reliable result.
In the embodiment according to Figure 4 also, it is possible to support the inclined plate 2 in other positions then the third points, as these have solely been chosen to simplify the explanation.
At times it ;may be practically advantageous as shown in Figure 5 to place the inclined plate 1 downstream of the defle~~tion plate 17, the latter in this case preferably being curved and arranged with a vertical inlet and an outlet in the direction of the inclined plate 1, as well as being provided with a weighing cell 18 to measure the deflection force P. As in this case, the inT.et velocity vl on the inclined plate 1 will be used in the calculation instead of the outlet velocity v2, the mass flow M may be determined using the above equ~~tion by interchanging A and B.
a 2~ tip 677 LIST OF PARTS
1 inclined plate 2 upper point of support 3 lower point of support 4 weighing cell 5 weighing cell 6 weighing cell 7 adjustment screw 8 beam 9 pivot point 10 column 11 linkage rod 12 inlet plate 13 exit duct/outlet deflection plate 14 linkage rod 15 weighing cell 16 rod 17 inlet deflection plate 18 weighing cell
Claims (4)
1. Apparatus for weighing continuously flowing granular or powdery material, in which the mass flow of said material is determined as a function of measurements of forces exerted on an inclined first plate, which is substantially rectilinear in the direction of flow and on which the flowing material flows slidingly, characterized a) in that said first plate is supported at two different levels by first force-measuring means capable of measuring forces, of which the gravitational force exerted by the material flowing upon said first plate at each of said two levels comprises as a calculable component the force (A, B, A', B') exerted by the flowing material on the plate in a vertical plane and at right angles to the direction of flow, and a1) by at least one of a1a) second force-measuring means capable of measuring the frictional force (F) exerted by the flowing material upon said first plate, and a1b) a second plate placed in the path of the flow of material and adapted to change the direction of the flow having third force-measuring means capable of measuring solely the force (P), with which the flow is deflected to change its direction, as well as b) by calculating means for calculating the mass flow from b1) the forces (A, B) as measured by said first force-measuring means or as calculated from measurements by said first force-measuring means, and b2) from at least one of b2a) the frictional force (F) as measured by said second force-measuring means, and b2b) the deflection force (P) as measured by said third force-measuring means.
2. Apparatus according to claim 1, characterized a) in that said first force-measuring means are adapted to measure reaction forces (A
and B) in the third points of said first plate normal to the latter, b) in that second force-measuring means are adapted to measure the frictional reaction force (F) in the longitudinal direction of said first plate, and c) in that said calculating means are adapted to calculate the mass flow of said granular or powdery material as in which L is the length of said first plate, .alpha. is the angle of inclination of said first plate relative to the horizontal, and g is the acceleration of gravity.
and B) in the third points of said first plate normal to the latter, b) in that second force-measuring means are adapted to measure the frictional reaction force (F) in the longitudinal direction of said first plate, and c) in that said calculating means are adapted to calculate the mass flow of said granular or powdery material as in which L is the length of said first plate, .alpha. is the angle of inclination of said first plate relative to the horizontal, and g is the acceleration of gravity.
3. Apparatus according to claim 1, characterized a) in that said first force-measuring means are adapted to measure reaction forces (A', B'; A", B") at the upper edge and the mid-point of said first plate respectively, b) in that said second force-measuring means are adapted to measure the frictional reaction force (F';F") in the longitudinal direction of the plate, and c) in that said calculating means are adapted to calculate the mass flow of said granular or powdery material as or, if the first force-measuring means are vertical, in which L is the length of said first plate, .alpha. is the angle of inclination of said first plate relative to the horizontal, and g is the acceleration of gravity.
4. Apparatus according to claim 1 and in which said second plate is placed in the path of the flow of material and adapted to change the direction of the flow having third force-measuring means capable of measuring solely the force (P), with which the flow is deflected to change its direction, characterized in that said calculating means are adapted to calculate the mass flow of said granular or powdery material as in which P is the horizontal force of deflection, and L is the length of said first plate, .alpha. is the angle of inclination of said first plate relative to the horizontal, and g is the acceleration of gravity.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES92906607T ES2121009T3 (en) | 1992-02-12 | 1992-02-12 | MASS FLOW MEASUREMENT DEVICE. |
| EP92906607A EP0626062B1 (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| PCT/DK1992/000045 WO1993016356A1 (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| JP04505927A JP3066076B2 (en) | 1992-02-12 | 1992-02-12 | Device for measuring mass flow |
| CA002140677A CA2140677C (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| AU13750/92A AU668680B2 (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| HU9402268A HU215040B (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| RU94040359A RU2110775C1 (en) | 1992-02-12 | 1992-02-12 | Device for weighing of granulated or powder-like material flowing continuously |
| DK92906607T DK0626062T3 (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| DE69226204T DE69226204T2 (en) | 1992-02-12 | 1992-02-12 | FLOW AMOUNT DEVICE |
| US08/284,623 US5495773A (en) | 1992-02-12 | 1994-02-12 | Apparatus for weighing continuously flowing flowable material |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DK1992/000045 WO1993016356A1 (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| CA002140677A CA2140677C (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
| HU9402268A HU215040B (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2140677A1 CA2140677A1 (en) | 1993-08-19 |
| CA2140677C true CA2140677C (en) | 2002-04-23 |
Family
ID=27169937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002140677A Expired - Fee Related CA2140677C (en) | 1992-02-12 | 1992-02-12 | Apparatus for measuring mass flow |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5495773A (en) |
| EP (1) | EP0626062B1 (en) |
| JP (1) | JP3066076B2 (en) |
| AU (1) | AU668680B2 (en) |
| CA (1) | CA2140677C (en) |
| DE (1) | DE69226204T2 (en) |
| DK (1) | DK0626062T3 (en) |
| ES (1) | ES2121009T3 (en) |
| HU (1) | HU215040B (en) |
| RU (1) | RU2110775C1 (en) |
| WO (1) | WO1993016356A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2303457A (en) * | 1995-07-14 | 1997-02-19 | New Holland Belguim Nv | Mass flow metering device |
| JP3750125B2 (en) * | 1996-12-26 | 2006-03-01 | 株式会社サタケ | Impact type flow rate detector |
| GB2321111A (en) * | 1997-01-11 | 1998-07-15 | Ford New Holland Nv | Member for mass flow measurement |
| GB2321110A (en) * | 1997-01-11 | 1998-07-15 | Ford New Holland Nv | Member for mass flow measurement |
| GB2325052A (en) * | 1997-05-08 | 1998-11-11 | Ford New Holland Nv | Mass flow measuring apparatus |
| EP1130369A1 (en) | 2000-02-29 | 2001-09-05 | S.E.G. Mekanik Ab | Apparatus for measuring mass flow |
| SE522206C2 (en) * | 2000-10-31 | 2004-01-20 | Seg Mekanik Ab | Apparatus for apparatus for measuring the mass flow of mainly particulate material |
| US20090301220A1 (en) * | 2006-05-10 | 2009-12-10 | Katoen Natie | Device for measuring a mass flow |
| EP2647972B1 (en) * | 2012-04-03 | 2018-06-13 | WIPOTEC GmbH | Weighing device |
| CN103453961B (en) * | 2012-06-04 | 2016-12-07 | 丹东华信测控技术有限公司 | Plate-type solid electronic flow meter |
| JP6135874B2 (en) | 2015-04-09 | 2017-05-31 | 三協パイオテク株式会社 | Impact type powder flow meter |
| DE102022112046A1 (en) | 2022-05-13 | 2023-11-16 | CiTEX Holding GmbH | Method for determining a mass flow and conveying and measuring device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4157661A (en) * | 1978-03-07 | 1979-06-12 | Milltronics Limited | Flowmeters |
| DE2947414C2 (en) * | 1979-11-24 | 1986-04-30 | Carl Schenck Ag, 6100 Darmstadt | Measuring device for recording the conveying rate of a bulk material flow |
| DE3246006A1 (en) * | 1981-05-13 | 1983-05-05 | Unilever Ltd | TO WEIGH |
| FI69210C (en) * | 1984-07-16 | 1985-12-10 | Pekka M Vesa | MASSFLOEDESMAETARE |
| EP0380504A4 (en) * | 1987-08-04 | 1991-01-09 | Peter Adam Reuter | Flow line weighing device |
| AU621114B2 (en) * | 1988-05-03 | 1992-03-05 | Josef Neumuller | Method of and apparatus for weighing a continuous stream of fluent material |
-
1992
- 1992-02-12 RU RU94040359A patent/RU2110775C1/en not_active IP Right Cessation
- 1992-02-12 CA CA002140677A patent/CA2140677C/en not_active Expired - Fee Related
- 1992-02-12 DK DK92906607T patent/DK0626062T3/en active
- 1992-02-12 ES ES92906607T patent/ES2121009T3/en not_active Expired - Lifetime
- 1992-02-12 WO PCT/DK1992/000045 patent/WO1993016356A1/en active IP Right Grant
- 1992-02-12 HU HU9402268A patent/HU215040B/en not_active IP Right Cessation
- 1992-02-12 AU AU13750/92A patent/AU668680B2/en not_active Ceased
- 1992-02-12 DE DE69226204T patent/DE69226204T2/en not_active Expired - Fee Related
- 1992-02-12 JP JP04505927A patent/JP3066076B2/en not_active Expired - Lifetime
- 1992-02-12 EP EP92906607A patent/EP0626062B1/en not_active Expired - Lifetime
-
1994
- 1994-02-12 US US08/284,623 patent/US5495773A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| RU94040359A (en) | 1996-06-20 |
| DE69226204D1 (en) | 1998-08-13 |
| AU1375092A (en) | 1993-09-03 |
| JP3066076B2 (en) | 2000-07-17 |
| JPH07505706A (en) | 1995-06-22 |
| EP0626062A1 (en) | 1994-11-30 |
| DE69226204T2 (en) | 1998-10-22 |
| EP0626062B1 (en) | 1998-07-08 |
| HU215040B (en) | 1998-09-28 |
| RU2110775C1 (en) | 1998-05-10 |
| CA2140677A1 (en) | 1993-08-19 |
| HUT71154A (en) | 1995-11-28 |
| ES2121009T3 (en) | 1998-11-16 |
| AU668680B2 (en) | 1996-05-16 |
| US5495773A (en) | 1996-03-05 |
| HU9402268D0 (en) | 1994-10-28 |
| WO1993016356A1 (en) | 1993-08-19 |
| DK0626062T3 (en) | 1999-04-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |